ASTM E570-15
(Practice)Standard Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
Standard Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
SIGNIFICANCE AND USE
5.1 This practice outlines a procedure for examining ferromagnetic tubular products using the flux leakage method. If properly applied, this method is capable of detecting the presence and location of significant longitudinally or transversely oriented discontinuities such as pits, scabs, slivers, gouges, roll-ins, laps, seams, cracks, holes, and improper welds in ferromagnetic tubes under inspection. In addition, the severity of a discontinuity may be estimated and a rejection level set with respect to the magnitude of the electromagnetic indication produced by the discontinuity.
5.2 The response from natural discontinuities can be significantly different from the response for artificial discontinuities such as drilled holes or notches of equivalent depth. For this reason, sufficient work should be done to determine the conditions necessary to detect and mark natural discontinuities whose characteristics will adversely affect the serviceability of the tube, in order to establish acceptance criteria between the supplier and purchaser.
SCOPE
1.1 This practice covers the application and standardization of equipment using the flux leakage test method for detection of outer surface, inner surface, and subsurface discontinuities in ferromagnetic steel tubular products (Note 1) of uniform cross section such as seamless and welded tubing.
Note 1: The term “tube” or “tubular product” will be used to refer to both pipe and tubing.
1.2 This practice is intended for use on tubular products having outside diameters from approximately 1/2 to 24 in. (12.7 to 610 mm) with wall thicknesses to 1/2 in. (12.7 mm). These techniques have been used for other sizes, however, and may be so specified upon contractual agreement between the purchaser and the supplier.
1.3 This practice does not establish acceptance criteria; they must be specified by the using parties.
1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: E570 − 15
StandardPractice for
Flux Leakage Examination of Ferromagnetic Steel Tubular
1
Products
This standard is issued under the fixed designation E570; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* E1316 Terminology for Nondestructive Examinations
1.1 This practice covers the application and standardization 2.2 Other Documents:
of equipment using the flux leakage test method for detection SNT-TC-1A Recommended Practice for Personnel Qualifi-
of outer surface, inner surface, and subsurface discontinuities cation and Certification of NondestructiveTesting Person-
3
in ferromagnetic steel tubular products (Note 1) of uniform nel
cross section such as seamless and welded tubing. ANSI/ASNT CP-189 ASNT Standard for Qualification and
3
Certification of Nondestructive Testing Personnel
NOTE 1—The term “tube” or “tubular product” will be used to refer to
NAS-410 NAS Certification and Qualification of Nonde-
both pipe and tubing.
4
structive Personnel (Quality Assurance Committee)
1.2 This practice is intended for use on tubular products
ISO 9712 Non-destructive Testing—Qualification and Cer-
1
having outside diameters from approximately ⁄2 to 24 in. (12.7
5
tification of NDT Personnel
1
to 610 mm) with wall thicknesses to ⁄2 in. (12.7 mm). These
techniques have been used for other sizes, however, and may
3. Terminology
be so specified upon contractual agreement between the
3.1 Definitionsoftermsrelatingtofluxleakageexamination
purchaser and the supplier.
are provided in Terminology E1316.
1.3 This practice does not establish acceptance criteria; they
must be specified by the using parties.
4. Summary of Practice
1.4 The values stated in inch-pound units are to be regarded
4.1 This method consists of the following steps:
asthestandard.Thevaluesgiveninparenthesesaremathemati-
4.1.1 The tube wall is magnetized at the area under exami-
cal conversions to SI units that are provided for information
nation to a proper level approaching magnetic saturation.
only and are not considered standard.
NOTE 2—Tubes subjected to magnetic inspections can retain various
1.5 This standard does not purport to address the safety
strengthsandconfigurationofresidualmagneticfieldsdependinguponthe
concerns, if any, associated with its use. It is the responsibility
magnetization technique. If the residual field resulting from a given
of the user of this standard to establish appropriate safety and
technique can interfere with subsequent applications of the tube, then a
health practices and determine the applicability of regulatory
supplemental demagnetization process may be required.
limitations prior to use.
4.1.2 A flux sensor containing magnetic transducers is
placed on or above the outside surface of the tube in the
2. Referenced Documents
magnetized area.
2
2.1 ASTM Standards:
4.1.3 Either the tube or the flux sensor is moved at a
E543 Specification for Agencies Performing Nondestructive
constant speed in the direction of the magnetic field so that the
Testing
sensor scans the entire surface of the tube.
4.1.4 Each magnetic transducer in the flux sensor is con-
nected to an electronic console which amplifies, filters, and
1
This practice is under the jurisdiction of ASTM Committee E07 on Nonde-
structive Testing and is the direct responsibility of Subcommittee E07.07 on
Electromagnetic Method.
CurrenteditionapprovedJune1,2015.PublishedJuly2015.Originallyapproved
3
in1976.Lastpreviouseditionapprovedin2009asE570 - 09.DOI:10.1520/E0570- AvailablefromAmericanSocietyforNondestructiveTesting(ASNT),P.O.Box
15. 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from Aerospace Industries Association of America, Inc., 1250 Eye
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM St., NW, Washington, DC 20005.
5
Standards volume information, refer to the standard’s Document Summary page on Available from International Organization for Standardization (ISO), 1, ch. de
the ASTM website. la Voie-Creuse, CP 56, CH-1211 Geneva 20, Switzerland, http://www.iso.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E570 − 15
electronically processes the signals such that significant dis- 7. Interferences
continuities are indicated (visually,
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E570 − 09 E570 − 15
Standard Practice for
Flux Leakage Examination of Ferromagnetic Steel Tubular
1
Products
This standard is issued under the fixed designation E570; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope Scope*
1.1 This practice covers the application and standardization of equipment using the flux leakage test method for detection of
outer surface, inner surface, and subsurface discontinuities in ferromagnetic steel tubular products (Note 1) of uniform cross
section such as seamless and welded tubing.
NOTE 1—The term “tube” or “tubular product” will be used to refer to both pipe and tubing.
1
1.2 This practice is intended for use on tubular products having outside diameters from approximately ⁄2 to 24 in. (12.7 to 610
1
mm) with wall thicknesses to ⁄2 inin. (12.7 mm). These techniques have been used for other sizes, however, and may be so
specified upon contractual agreement between the purchaser and the supplier.
1.3 This practice does not establish acceptance criteria; they must be specified by the using parties.
1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.5 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the
user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations
prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
E543 Specification for Agencies Performing Nondestructive Testing
E1316 Terminology for Nondestructive Examinations
2.2 Other Documents:
3
SNT-TC-1A Recommended Practice for Personnel Qualification and Certification of Nondestructive Testing Personnel
3
ANSI/ASNT CP-189 ASNT Standard for Qualification and Certification of Nondestructive Testing Personnel
4
NAS-410 NAS Certification and Qualification of Nondestructive Personnel (Quality Assurance Committee)
5
ISO 9712 Non-destructive Testing—Qualification and Certification of NDT Personnel
3. Terminology
3.1 Definitions of terms relating to flux leakage examination are provided in Terminology E1316.
4. Summary of Practice
4.1 This method consists of the following steps:
4.1.1 The tube wall is magnetized at the area under examination to a proper level approaching magnetic saturation.
1
This practice is under the jurisdiction of ASTM Committee E07 on Nondestructive Testing and is the direct responsibility of Subcommittee E07.07 on Electromagnetic
Method.
Current edition approved June 1, 2009June 1, 2015. Published June 2009 July 2015. Originally approved in 1976. Last previous edition approved in 20042009 as
ε1
E570 - 97E570 - 09.(2004) . DOI: 10.1520/E0570-09.10.1520/E0570-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
4
Available from Aerospace Industries Association of America, Inc., 1250 Eye St., NW, Washington, DC 20005.
5
Available from International Organization for Standardization (ISO), 1, ch. de la Voie-Creuse, CP 56, CH-1211 Geneva 20, Switzerland, http://www.iso.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E570 − 15
NOTE 2—Tubes subjected to magnetic inspections can retain various strengths and configuration of residual magnetic fields depending upon the
magnetization technique. If the residual field resulting from a given technique can interfere with subsequent applications of the tube, then a supplemental
demagnetization process may be required.
4.1.2 A flux sensor containing magnetic transducers is placed on or above the outside surface of the tube in the magnetized ar
...
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